Adamyan, V.M. (2007) “Mark Grigorievich Krein (to the centenary of his birth)”, Ukrains’kyi Matematychnyi Zhurnal, 59(5), pp. 579–587. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3333 (Accessed: 16 February 2026).